I went to an Apple store for the iP4 launch. It was in a mall, so there were restrictions as to what time people were allowed to queue up--they weren't allowing anyone on mall property before 5 am. I got there a touch before 5 and was able to get into the parking lot; once 5:00 hit, it was a freaking stampede to line up. People were dodging cars. Total chaos. I was probably 200th or so in line (bad parking spot) before they separated the lines into those with reservations and those without (I had one). After the split, I was probably 150th. Ugh.
After they let us into the mall, they started off taking only those with reservations, but that didn't last long. They then started alternating taking in walk-ins and those with reservations. Our phones were secure and were in no danger of being given away, but it took ONE HELL of a lot longer to move through the line, especially since they were setting up everyone's phones individually. Why they couldn't have a separate line for those of us who know WTF we're doing is beyond me. I got out of there at around 12:30 or so. All in all, it was a pain in the ass, but I enjoyed having the experience. I'd always wanted to see what a launch day at an Apple store was like, and now I have.